With all accounts, SpamAssasin is included. It is disabled by default. You can turn it on yourself in your website admin area. If you have trouble, let us know and we'll turn it on for you.
Additionally, over the years we've collected IP addresses of the mass spammers and we can include these IP addresses in your blacklist to make your spam mail go down to almost nothing. You will have to let us know you want our black list applied to your account and we will add these for free.
We will give you a free tip to boot. NEVER use your real email address when selling things on craigslist.com! It's a joke the lack of security on that place. Hackers and spammers alike just wait for ads to come pouring in. They grab your data and off to the races they go! Register a free email account at Yahoo, Google or Hotmail and use that. When your item sells, close the account or keep it open for future sales.